US3134918A - Signal generator with lost motion drive - Google Patents

Signal generator with lost motion drive Download PDF

Info

Publication number
US3134918A
US3134918A US95632A US9563261A US3134918A US 3134918 A US3134918 A US 3134918A US 95632 A US95632 A US 95632A US 9563261 A US9563261 A US 9563261A US 3134918 A US3134918 A US 3134918A
Authority
US
United States
Prior art keywords
shaft
rotor
speed
motion
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US95632A
Inventor
Carl G Eichenberger
Stack Samuel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
W AND L E GURLEY
Original Assignee
W AND L E GURLEY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W AND L E GURLEY filed Critical W AND L E GURLEY
Priority to US95632A priority Critical patent/US3134918A/en
Application granted granted Critical
Publication of US3134918A publication Critical patent/US3134918A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors

Definitions

  • This invention relates to an improved apparatus for measuring and indicating the rotational speed of a driven ,7
  • shaft speed-indicating devices of the type having stationary signal-generating means cooperating with an element secured to the shaft for producing visible, audible, or electric signals Which are indicative of shaft speed.
  • a ferromagnetic rotor element pro- .vided. ,with a circumferential I series 1 of uniformly-spaced teeth is rigidly secured to the shaft for rotation relatively .to a stationary magnetic pick-up head.
  • the pick-up head includes a ferromagnetic core upon which is wound an electrical coil. The flux changes whichare produced in the core'by the passage of the. rotor teethgenerate in the ,coil electrical pulses having a frequencyldependent both upon the number of teeth and the speed of rotation of the .shaft.
  • a major drawback of the known shaft speed measuring :devices resides in the fact that for very low shaft speeds .thegenerated signals are not sharply defined, and consequently, detection of the signals and accurate measuring .of the shaft speed are rendered most diificult.
  • the rateof flux change in the iron core is relatively low, and'since the voltage generated in the coil is directly proportional to the rate of fluxchange, the amplitudes of the.
  • the object of the present invention is to provide an im- I proved apparatus for measuring, the relative speed of movement between two elements arranged for travel past eachother, one of said elements carrying energizing means and .the other of said elements carrying signal-generating means operable by said energizing means to. produce a signal having a property which varies as a function of the rate of movement between the means.
  • at least one of-the twomeans mentionedabove is connected With its supporting element by a lost-motion coupling; and magneticme'ans areprovided which oper- -..ate, when the two supporting elements are moving toward each other at a low'rate of speed,.to, cause at least one ofthe two; means, to accelerate momentarily to.
  • the invention relates to devices for measuring the re'lativejspeeds of elements havinglinear or curvilin'earmotion.
  • the preferred embodiment of theinvention relates to a device of the electrical type for measuring the speed of rotation of a rotating shaft.
  • This embodiment includes a rotorloosely coupled with the shaft fornormal simultaneous movement therewith, said rotor being formed of a non-magnetic material and carrying, adjacent its outer periphery, at least one. ferromagnetic bar. 1 Stationary 3,134,918 Patented May 26, 1 964;
  • the permanent magnet of the pick-up head is specifically designed to apply to the ferromagnetic member a force of. magnetic attraction Which causes the rotor to be momentarly accelerated to an instantaneous speed which is graeter than the rotational speed ofthe shaft as the ferromagnetic member approaches the pick-up means. In this manner, the rate of flux change is increased to generate pulses of magnified amplitude and sharpness.
  • FIG. 1 is a plan view of the shaft speed measuring apparatus.
  • FIG. 2 is a sectional view taken along line 22 of FIG. 1.
  • a driven shaft Sis journal- .nalled in bearing means (not shown) for rotation relatively to the stationary magnetic pick-up head 6 of the shaft speed indicating device 7.
  • the shaft 5 has an end portion 5a of reduced diameter upon which is loosely mounted an annular rotor 8 formed of a non-magnetic material, such as one of the light-weight synthetic plastics (polyethylene, for example).
  • the diameter of the bore of rotor Sis slightly greater than that of shaft portion 5a .80 that the rotor turns freely on the shaft.
  • Embedded in the outer periphery of the rotor parallel with the axis of shaftS are a plurality of uniformly-spaced ferromagnetic bars 9.
  • the rotor 8 is loosely coupled with the shaft 5 by means of the metal rod 11.
  • Rod 11, at one end, extends through the transverse opening 5b in the shaft portion 5a and, atthe otherend, is bent at a right angle to form an arm portion which extends into the recess 8a in the adjacent end face of rotor 8. Opening 5b and are slightly oversize to permit a small degree of play between the elements.
  • The. stationary magnetic pick-up head 6 is arranged adjacent the outer periphery of the rotor and includes a permanent magnet core 12 (formed of .Alnico 5, for example) upon which .is wound an insulated electrical coil -13.
  • Coil 13 is connected with the detecting and'indicating means 7 view conductors 14 and 15.
  • the detecting and indicating means 7 are conventional and serve to produce a voltage the magnitude of which is proportional to the number. of pulses generated in coil. 13 per unit time.
  • this voltage is a direct function of therotational speed of the shaft and indicated by conventional readout means.
  • the driven shaft 5 is connected, either directly or through suitable transmission means, with, a
  • rotating driving'element for example, the fluid-driven shaft of "ananemometery Assuming that the shaft-5. is in an initial state of rest and that a counterclockwise driving torque is applied thereto (as indicated: by t-hearrow in FIG. 1), then-as the shaft turns througha small angle 0 in the counterclockwise direction, the. rotor 8,.owing to its inertia and to-the forces of magnetic attraction described below, is maintained momentarily in itsinitial state of repose and the-rod 11 pivots, in the-oversized bores 5b and 8a, toward an endpositionof its lost-motion degree of travel.
  • the. rotor 8 owing to its inertia and to-the forces of magnetic attraction described below, is maintained momentarily in itsinitial state of repose and the-rod 11 pivots, in the-oversized bores 5b and 8a, toward an endpositionof its lost-motion degree of travel.
  • the lag angle decreases to zero and bar 9, which is now traveling at a relatively high rate of speed, effects a rapid change of flux in magnet 12 to generate a sharply-defined pulse of large amplitude in coil 13.
  • the improved operation resulting from the use of the lost-motion coupling in combination with the force of magnetic attraction may be illustrated with reference to FIG. 3 wherein the dashed line shows the low-peak pulse waveform which would be obtained for a given speed of rotation when the rotor is rigidly secured to the shaft and the magnetic attracting means are omitted, and the solid line illustrates the improved high-peak pulse waveform obtained as a result of the present invention.
  • the momentum imparted to the rotor 8 by the force of magnetic attraction may cause the rotor to lead the shaft momentarily as a given bar passes the pick-up head. However, as the shaft continues to turn in the counterclockwise direction, the force of magnetic attraction between the given bar 9 and the magnet 12 causes the rotor to lag again behind the shaft by the lag angle 6. The momentary acceleration of the rotor described above is repeated each time a rotor bar 9 is moved within the field of the permanent magnet 12.
  • the coupling rod 11' may be provided with a second arm portion 11a which is horizontal and normal to the plane containing the body portion of the rod and the arm portion which extends downward into the oversize recess in the upper surface of the rotor.
  • the weight of this second arm portion 11a assists in initiating the snap movement of the rotor as a bar 9 just enters the magnetic field of the magnet during low speed rotation of the shaft.
  • loose coupling has been illustrated and described as being a rod supported loosely in oversized bores, the use of a resilient spring, flexible coupling, or other lost-motion coupling device is not excluded.
  • a speed indicating device comprising a pair of relatively movable elements arranged for movement past each other along a path of motion; energizing means associated with one of said elements; signabgenerating means associated with the other of said elements and operable by the energizing means to produce a signal having a property which varies as a function of the rate of relative movement between the means; a lost-motion connection between at least one of said means and its associated element and arranged to permit relative movement therebetween only along said path of motion; a ferromagnetic member secured to one of said means; and a magnet secured to the other of said means for applying a force of magnetic attraction to said ferromagnetic member.
  • a speed indicating device comprising a rotary shaft adapted to be driven at variable speeds; an annular rotor mounted on said shaft and normally rotating with said shaft in a substantially fixed plane, said rotor being formed of a non-magnetic material; at least one ferromagnetic member secured to the rotor adjacent its outer periphery; lost-motion coupling means connectnig said rotor with said shaft and permitting relative angular movement therebetween in said plane at low shaft speeds; signal-generating means cooperating with said.
  • said shaft contains a bore extending transversely therethrough and said rotor contains a recess in one end surface thereof; and further wherein said coupling means comprises a rod having a linear body portion mounted in said bore and extending normal to the shaft, a first arm portion at one end of and normal to said body portion, said first arm portion extending into said rotor recess, and a second arm portion at the other end of said body portion, said second arm portion being normal to the plane containing said body portion and said first arm portion, the crosssectional dimensions of said bore and said recess being greater than the corresponding cross-sectional dimensions of the body and first arm portions, respectively, of said rod.
  • said signalgenerating means includes a magnetic pick-up head comprising a permanent magnet core and an electrical coil associated with said core for generating an electrical signal when the flux in said core is varied by the passage of the ferromagnetic member; and further wherei said permanent magnet core constitutes said magnet means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

y 6, 1964 c. G. EICHENBERGER ETAL 3, 34,9 8
SIGNAL GENERATOR WITH LOST MOTION DRIVE Filed March 14, 1961 TIME INVENTOR5 PL 6. EIOI'EVBERGER) s/v/vua 57:70,
BY M M ATTORNEY 5 S tes Patent t z 3,134,918 v SIGNAL GENERATOR WITH LOST f MOTION DRIVE Carl G. Ei'chenbe'rger and Samuel Stack, Troy, N.Y., assignors to W. & L. E.-Gu 'ley, Troy, N.Y., a corporationof New York I a Filed Mar.'14, 1961, Ser. No. 95,632
I 6 Claims. (Cl; 310-168) This invention relates to an improved apparatus for measuring and indicating the rotational speed of a driven ,7
shaft. I I
i It is known in the prior art to provide shaft speed-indicating devicesof the type having stationary signal-generating means cooperating with an element secured to the shaft for producing visible, audible, or electric signals Which are indicative of shaft speed. In one known elec- .trical embodiment, a ferromagnetic rotor element pro- .vided. ,with a circumferential I series 1 of uniformly-spaced teeth is rigidly secured to the shaft for rotation relatively .to a stationary magnetic pick-up head. The pick-up head includes a ferromagnetic core upon which is wound an electrical coil. The flux changes whichare produced in the core'by the passage of the. rotor teethgenerate in the ,coil electrical pulses having a frequencyldependent both upon the number of teeth and the speed of rotation of the .shaft.
I A major drawback of the known shaft speed measuring :devices resides in the fact that for very low shaft speeds .thegenerated signals are not sharply defined, and consequently, detection of the signals and accurate measuring .of the shaft speed are rendered most diificult. In the ferromagneticrotor. embodiment, for example, at low shaft speeds the rateof flux change in the iron core is relatively low, and'since the voltage generated in the coil is directly proportional to the rate of fluxchange, the amplitudes of the. signals are very'small- The object of the present invention is to provide an im- I proved apparatus for measuring, the relative speed of movement between two elements arranged for travel past eachother, one of said elements carrying energizing means and .the other of said elements carrying signal-generating means operable by said energizing means to. produce a signal having a property which varies as a function of the rate of movement between the means. According to the invention; at least one of-the twomeans mentionedabove is connected With its supporting element by a lost-motion coupling; and magneticme'ans areprovided which oper- -..ate, when the two supporting elements are moving toward each other at a low'rate of speed,.to, cause at least one ofthe two; means, to accelerate momentarily to. produce i an instantaneous relativespeed between the two means Iwhichexceeds the 'relativesp'e'ed of movement between .the two elements. As a, result of this momentary acceleration of therotor and the-resulting increased rateof reaction between the, energizing means and'the signal-gener- I ating means, a s'harper' and more, pronounced signal ,is obtained. Inits broadest sense, the invention relates to devices for measuring the re'lativejspeeds of elements havinglinear or curvilin'earmotion.
' The preferred embodiment of theinvention relates to a device of the electrical type for measuring the speed of rotation of a rotating shaft. This embodiment includes a rotorloosely coupled with the shaft fornormal simultaneous movement therewith, said rotor being formed of a non-magnetic material and carrying, adjacent its outer periphery, at least one. ferromagnetic bar. 1 Stationary 3,134,918 Patented May 26, 1 964;
ice
the coil which is detected by conventional'electrical indicating means connected thereto. The permanent magnet of the pick-up head is specifically designed to apply to the ferromagnetic member a force of. magnetic attraction Which causes the rotor to be momentarly accelerated to an instantaneous speed which is graeter than the rotational speed ofthe shaft as the ferromagnetic member approaches the pick-up means. In this manner, the rate of flux change is increased to generate pulses of magnified amplitude and sharpness.
Other objects and advantages of the invention will become more apparent from a study of the following specification when considered in conjunction with the accompanying drawing, in which: 1
FIG. 1 is a plan view of the shaft speed measuring apparatus.
FIG. 2 is a sectional view taken along line 22 of FIG. 1.
device using another coupling rod embodiment.
Referring to FIGS. 1 and 2, a driven shaft Sis jour- .nalled in bearing means (not shown) for rotation relatively to the stationary magnetic pick-up head 6 of the shaft speed indicating device 7. The shaft 5 has an end portion 5a of reduced diameter upon which is loosely mounted an annular rotor 8 formed of a non-magnetic material, such as one of the light-weight synthetic plastics (polyethylene, for example). The diameter of the bore of rotor Sis slightly greater than that of shaft portion 5a .80 that the rotor turns freely on the shaft. Embedded in the outer periphery of the rotor parallel with the axis of shaftS are a plurality of uniformly-spaced ferromagnetic bars 9. The rotor 8 is loosely coupled with the shaft 5 by means of the metal rod 11. Rod 11, at one end, extends through the transverse opening 5b in the shaft portion 5a and, atthe otherend, is bent at a right angle to form an arm portion which extends into the recess 8a in the adjacent end face of rotor 8. Opening 5b and are slightly oversize to permit a small degree of play between the elements.
The. stationary magnetic pick-up head 6 is arranged adjacent the outer periphery of the rotor and includes a permanent magnet core 12 (formed of .Alnico 5, for example) upon which .is wound an insulated electrical coil -13. Coil 13 is connected with the detecting and'indicating means 7 view conductors 14 and 15. The detecting and indicating means 7 are conventional and serve to produce a voltage the magnitude of which is proportional to the number. of pulses generated in coil. 13 per unit time. The
value of this voltage is a direct function of therotational speed of the shaft and indicated by conventional readout means.
,In operation, the driven shaft 5 is connected, either directly or through suitable transmission means, with, a
rotating driving'element (for example, the fluid-driven shaft of "ananemometery Assuming that the shaft-5. is in an initial state of rest and that a counterclockwise driving torque is applied thereto (as indicated: by t-hearrow in FIG. 1), then-as the shaft turns througha small angle 0 in the counterclockwise direction, the. rotor 8,.owing to its inertia and to-the forces of magnetic attraction described below, is maintained momentarily in itsinitial state of repose and the-rod 11 pivots, in the-oversized bores 5b and 8a, toward an endpositionof its lost-motion degree of travel. When the rod 11 reaches this end positlon, the driving force of the shaft is transmitted ,directly to the rotor, and further rotation of the shaft effects simultaneous rotation of the rotor through the rod. The rotor now lags behind the shaft by the angle 0.
Assuming that the shaft 5 is driven at a very low rate of speed, that the mass of rotor 8 is relatively low, and that the magnetic force of attraction between the permanent magnet 12 and each of the rotor bars 9 is very high, then as the shaft 5 rotates to a position in which a given bar 9 just enters the field of the stationary magnet 12 the bar is magnetically attracted toward the magnet with such a force that the rotor 8 is caused to accelerate on the shaft 5 (as permitted by the loose coupling) and to obtain an instantaneous speed which is greater than the speed of rotation of the shaft. The lag angle decreases to zero and bar 9, which is now traveling at a relatively high rate of speed, effects a rapid change of flux in magnet 12 to generate a sharply-defined pulse of large amplitude in coil 13. The improved operation resulting from the use of the lost-motion coupling in combination with the force of magnetic attraction may be illustrated with reference to FIG. 3 wherein the dashed line shows the low-peak pulse waveform which would be obtained for a given speed of rotation when the rotor is rigidly secured to the shaft and the magnetic attracting means are omitted, and the solid line illustrates the improved high-peak pulse waveform obtained as a result of the present invention.
The momentum imparted to the rotor 8 by the force of magnetic attraction may cause the rotor to lead the shaft momentarily as a given bar passes the pick-up head. However, as the shaft continues to turn in the counterclockwise direction, the force of magnetic attraction between the given bar 9 and the magnet 12 causes the rotor to lag again behind the shaft by the lag angle 6. The momentary acceleration of the rotor described above is repeated each time a rotor bar 9 is moved within the field of the permanent magnet 12.
For relatively high rotational speeds of the shaft 5 producing peripheral rotor speeds equal to or greater than the speed at which a given rotor bar is attracted to the permanent magnet, the force of magnetic attraction has no effect on the rotor, and consequently, the rotor continuously lags behind the shaft by the constant lag angle 0. A flux change is effected in magnet 12 each time a bar 9 passes thereby, and since the bars are travelling at a high rate of speed, the generated pulses have large amplitud'es and are readily detected, integrated and indicated by the indicating device 7.
Referring to FIG. 4, the coupling rod 11' may be provided with a second arm portion 11a which is horizontal and normal to the plane containing the body portion of the rod and the arm portion which extends downward into the oversize recess in the upper surface of the rotor. The weight of this second arm portion 11a assists in initiating the snap movement of the rotor as a bar 9 just enters the magnetic field of the magnet during low speed rotation of the shaft.
Although the loose coupling has been illustrated and described as being a rod supported loosely in oversized bores, the use of a resilient spring, flexible coupling, or other lost-motion coupling device is not excluded.
While the presently preferred embodiment of the invention has been illustrated and described in the accompanying specification and drawing, it is apparent that other changes may be made in the apparatus described without deviating from the invention set forth in the following claims.
What is claimed is: I
1. A speed indicating device comprising a pair of relatively movable elements arranged for movement past each other along a path of motion; energizing means associated with one of said elements; signabgenerating means associated with the other of said elements and operable by the energizing means to produce a signal having a property which varies as a function of the rate of relative movement between the means; a lost-motion connection between at least one of said means and its associated element and arranged to permit relative movement therebetween only along said path of motion; a ferromagnetic member secured to one of said means; and a magnet secured to the other of said means for applying a force of magnetic attraction to said ferromagnetic member.
2. A speed indicating device comprising a rotary shaft adapted to be driven at variable speeds; an annular rotor mounted on said shaft and normally rotating with said shaft in a substantially fixed plane, said rotor being formed of a non-magnetic material; at least one ferromagnetic member secured to the rotor adjacent its outer periphery; lost-motion coupling means connectnig said rotor with said shaft and permitting relative angular movement therebetween in said plane at low shaft speeds; signal-generating means cooperating with said. rotor to produce a signal having a property which is a function of the relative rate of movement between said signal-generating means and said rotor; and magnet means cooperating with the ferromagnetic member for momentarily accelerating said rotor to an instantaneous speed which is greater than the speed of rotation of said shaft when said ferromagnetic member approaches said signal-generating means.
3. Apparatus as defined in claim 2 wherein said shaft contains a bore extending transversely therethrough and said rotor contains a recess in one end surface thereof; and further wherein said coupling means comprises a rod having a linear body portion mounted in said bore and extending normal to the shaft, a first arm portion at one end of and normal to said body portion, said first arm portion extending into said rotor recess, and a second arm portion at the other end of said body portion, said second arm portion being normal to the plane containing said body portion and said first arm portion, the crosssectional dimensions of said bore and said recess being greater than the corresponding cross-sectional dimensions of the body and first arm portions, respectively, of said rod.
4. Apparatus as defined in claim 2, wherein said signalgenerating means includes a magnetic pick-up head comprising a permanent magnet core and an electrical coil associated with said core for generating an electrical signal when the flux in said core is varied by the passage of the ferromagnetic member; and further wherei said permanent magnet core constitutes said magnet means.
5. A speed indicating device comprising a pair of relatively movable elements arranged for movement past each other along a path of motion at a variable relative speed; energizing means associated with one of said elements; signal generating means associated with the other of said elements and operable by the energizing means toJproduce a signal having a property which is a function of the rate of relative movement between the means; a lostmotion connection between at least one of said means and its associated element, said connection permitting relative movement therebetween along said path of motion only when said relative speed is low; a ferromagnetic member secured to said one means; and a magnet secured to the other of said means for applying a force of magnetic attraction to said ferromagnetic member.
6. Apparatus as defined in claim 5 wherein when said relative speed is low, the lost motion connection permits the magnet in cooperation with the ferromagnetic member to momentarily accelerate said one means relative to the other means.
References Cited in the file of this patent UNITED STATES PATENTS 5 ,523 McCullough Nov. 9, 1948 4, 67 Artzt Nov. 23, 1948 2,900,589 Putnocky "a", Aug. 18, 1959

Claims (1)

1. A SPEED INDICATING DEVICE COMPRISING A PAIR OF RELATIVELY MOVABLE ELEMENTS ARRANGED FOR MOVEMENT PAST EACH OTHER ALONG A PATH OF MOTION; ENERGIZING MEANS ASSOCIATED WITH ONE OF SAID ELEMENTS; SIGNAL-GENERATING MEANS ASSOCIATED WITH THE OTHER OF SAID ELEMENTS AND OPERABLE BY THE ENERGIZING MEANS TO PRODUCE A SIGNAL HAVING A PROPERTY WHICH VARIES AS A FUNCTION OF THE RATE OF RELATIVE MOVEMENT BETWEEN THE MEANS; A LOST-MOTION CONNECTION BETWEEN AT LEAST ONE OF SAID MEANS AND ITS ASSOCIATED ELEMENT AND ARRANGED TO PERMIT RELATIVE MOVEMENT THEREBETWEEN ONLY ALONG SAID PATH OF MOTION; A FERROMAGNETIC MEMBER SECURED TO ONE OF SAID MEANS; AND A MAGNET SECURED TO THE OTHER OF SAID MEANS FOR APPLYING A FORCE OF MAGNETIC ATTRACTION TO SAID FERROMAGNETIC MEMBER.
US95632A 1961-03-14 1961-03-14 Signal generator with lost motion drive Expired - Lifetime US3134918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US95632A US3134918A (en) 1961-03-14 1961-03-14 Signal generator with lost motion drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US95632A US3134918A (en) 1961-03-14 1961-03-14 Signal generator with lost motion drive

Publications (1)

Publication Number Publication Date
US3134918A true US3134918A (en) 1964-05-26

Family

ID=22252879

Family Applications (1)

Application Number Title Priority Date Filing Date
US95632A Expired - Lifetime US3134918A (en) 1961-03-14 1961-03-14 Signal generator with lost motion drive

Country Status (1)

Country Link
US (1) US3134918A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480812A (en) * 1967-08-17 1969-11-25 Gen Electric Signal generating device for use in conjunction with a dynamoelectric machine and the like
US3505879A (en) * 1968-07-31 1970-04-14 Ford Motor Co Electrical generator including components of an automotive vehicle mechanical speedometer
US3515921A (en) * 1968-04-01 1970-06-02 Philips Corp Device for producing a pulse sequence
US3541369A (en) * 1968-03-15 1970-11-17 Nippon Musical Instruments Mfg Speed detecting apparatus for a rotatable loud-speaker
DE2350408A1 (en) * 1973-10-08 1975-04-10 Tschimkentskij Sawod Pressow A Mechanical press ram stroke regulator - has speed sensor with armature formed by secondary system of linear motor
US3961214A (en) * 1975-06-18 1976-06-01 International Telephone & Telegram Corporation Velocity pick-off with noise cancellation
US4364011A (en) * 1979-05-16 1982-12-14 Ransome Hoffmann Pollard Ltd. Mechanical assemblies employing sensing means for sensing motion or position
US4384252A (en) * 1979-05-11 1983-05-17 The Bendix Corporation Cup shaped magnetic pickoff for use with a variable reluctance motion sensing system
US4536708A (en) * 1981-07-02 1985-08-20 Volkswagenwerk Aktiengesellschaft Apparatus for obtaining an information on the motion of a moving element, preferably for rotational speed of a rotating element in an automobile
US4574237A (en) * 1982-11-13 1986-03-04 Robert Bosch Gmbh Rotary speed measuring apparatus
US4853575A (en) * 1984-08-31 1989-08-01 Black & Decker Inc. Tachometer generator
US5608279A (en) * 1993-12-13 1997-03-04 Murray; David E. DC generator
US20190113133A1 (en) * 2017-10-16 2019-04-18 Hyundai Motor Company Vehicle and control method for the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453523A (en) * 1947-03-24 1948-11-09 Chefford Master Mfg Co Inc Bicycle generator regulated by rotor torque variations
US2454367A (en) * 1944-11-29 1948-11-23 Rca Corp Wave generating system
US2900589A (en) * 1957-10-28 1959-08-18 Jr Joseph G Putnocky Magnetic governor-controlled constant-speed motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454367A (en) * 1944-11-29 1948-11-23 Rca Corp Wave generating system
US2453523A (en) * 1947-03-24 1948-11-09 Chefford Master Mfg Co Inc Bicycle generator regulated by rotor torque variations
US2900589A (en) * 1957-10-28 1959-08-18 Jr Joseph G Putnocky Magnetic governor-controlled constant-speed motor

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3480812A (en) * 1967-08-17 1969-11-25 Gen Electric Signal generating device for use in conjunction with a dynamoelectric machine and the like
US3541369A (en) * 1968-03-15 1970-11-17 Nippon Musical Instruments Mfg Speed detecting apparatus for a rotatable loud-speaker
US3515921A (en) * 1968-04-01 1970-06-02 Philips Corp Device for producing a pulse sequence
US3505879A (en) * 1968-07-31 1970-04-14 Ford Motor Co Electrical generator including components of an automotive vehicle mechanical speedometer
DE2350408A1 (en) * 1973-10-08 1975-04-10 Tschimkentskij Sawod Pressow A Mechanical press ram stroke regulator - has speed sensor with armature formed by secondary system of linear motor
US3961214A (en) * 1975-06-18 1976-06-01 International Telephone & Telegram Corporation Velocity pick-off with noise cancellation
US4384252A (en) * 1979-05-11 1983-05-17 The Bendix Corporation Cup shaped magnetic pickoff for use with a variable reluctance motion sensing system
US4364011A (en) * 1979-05-16 1982-12-14 Ransome Hoffmann Pollard Ltd. Mechanical assemblies employing sensing means for sensing motion or position
US4536708A (en) * 1981-07-02 1985-08-20 Volkswagenwerk Aktiengesellschaft Apparatus for obtaining an information on the motion of a moving element, preferably for rotational speed of a rotating element in an automobile
US4574237A (en) * 1982-11-13 1986-03-04 Robert Bosch Gmbh Rotary speed measuring apparatus
US4853575A (en) * 1984-08-31 1989-08-01 Black & Decker Inc. Tachometer generator
US5608279A (en) * 1993-12-13 1997-03-04 Murray; David E. DC generator
US20190113133A1 (en) * 2017-10-16 2019-04-18 Hyundai Motor Company Vehicle and control method for the same

Similar Documents

Publication Publication Date Title
US3134918A (en) Signal generator with lost motion drive
US12323022B2 (en) Tangentially actuated magnetic momentum transfer generator
US3549925A (en) Alternating current generator
JPS63127163A (en) Speed and acceleration detector
US3207982A (en) Apparatus for measuring and displaying the characteristics of beams of charged particles
US4319151A (en) Pulse generator
US3548663A (en) Electrical generator including components of an automotive vehicle mechanical speedometer
US3790831A (en) Apparatus for damping oscillations in a stepping motor
US3505879A (en) Electrical generator including components of an automotive vehicle mechanical speedometer
US4084502A (en) Electric acutating device
US4263525A (en) Signal generating means
GB791827A (en) Improvements in or relating to accelerometers
US7248038B2 (en) Device for the detection of movements and/or positions of an object
KR850000834A (en) Permanent Magnet Motor
DE1268399B (en) Arrangement for measuring and / or controlling the movement of machines
US4027182A (en) Rate independent pulse generator
US4443724A (en) Shaft transducer having DC output proportional to angular velocity
US3299353A (en) Electrical speedometer utilizing unsymmetrically positioned field coils
US3482130A (en) Reluctance pickup speed device for a speedometer cable
US4689532A (en) Ferritic sensor, self-controlled synchronous motor
GB1428254A (en) Sewing machine with a needle position detecting arrangement
GB1416925A (en) Magnetic-field-sensing apparatus
US3329893A (en) Electrical device for measuring the rate of an occurrence of an event
SU475550A1 (en) Speedometer
US3064146A (en) Arrangement for driving the oscillator of a timepiece